Urethral sonography is performed with high frequency probe after introducing saline or jelly in to the urethra. Sonography gives accurate information about the length and depth of spongiofibrosis.

Duplex Color Doppler of the Penis

For all impotent patients’ pre and post Papavarine injection into the penis with duplex color Doppler to demonstrate the arterial insufficiency or not is useful. In patients who have butterfly fracture of the pubic rami, the patient may have arteriogenic impotence. Ideally these patients need revascularization procedure preoperatively. Otherwise, this patient may land with bulbar urethral necrosis following mobilization and proximal transection of the bulbar urethra as this part gets its blood supply in a retrograde fashion through corpora cavernosa into glans and penile urethra. As this retrograde blood supply is inadequate the bulbar urethra undergoes necrosis or stenosis.

Ascending and Descending urethrogram

This is the most important investigation for stricture urethra. Ascending urethrogram gives us the distal urethral information regarding distensibility or narrowing and irregularity of urethra. The descending urethrogram provides information regarding the proximal urethral anatomy. The drawback of the investigation is because of the semi lateral position; the length of the stricture in the bulbar urethra is under estimated. Forceful injection of the contrast into the meatus may lead to intravasation of the contrast into veins.

CT/MRI

3 D CT reconstruction / MRI are useful investigations for pelvic fracture urethral injuries. It shows the site and size of hematoma due to injury.

Biopsy- for BXO, suspected urethral cancer

Biopsy of the urethra, glans and prepuce is necessary to establish the diagnosis of BXO. Suspected mass lesion in the urethra is biopsied to rule out the diagnosis of urethral cancer.